Hello,
Java 1.5's JVM Tool Interface provides several interesting ways to insert
instrumented byte code
(http://java.sun.com/j2se/1.5.0/docs/guide/jvmti/jvmti.html#bci):
* Static Instrumentation: The class file is instrumented before it is
loaded into the VM - for example, by creating a duplicate directory of *.class
files which have been modified to add the instrumentation. This method is
extremely awkward and, in general, an agent cannot know the origin of the class
files which will be loaded.
* Load-Time Instrumentation: When a class file is loaded by the VM, the raw
bytes of the class file are sent for instrumentation to the agent. The
ClassFileLoadHook event provides this functionality. This mechanism provides
efficient and complete access to one-time instrumentation.
* Dynamic Instrumentation: A class which is already loaded (and possibly
even running) is modified. This optional feature is provided by the
RedefineClasses function. Classes can be modified multiple times and can be
returned to their original state. The mechanism allows instrumentation which
changes during the course of execution.
Are there any plans to support that tool interface?
Regards,
Martin
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